Railway freight car side bearing housings

ABSTRACT

A SELF CLEARING, SELF CENTERING SIDE BEARING, A HOUSING STRUCTURE HAVING A ROLLER FOR ENGAGEMENT WITH THE CAR BODY UNDER SERVICE CONDITIONS. THE HOUSING FOR THE ROLLER IS FORMED OF A GREEN SAND CASTING FREE OF CORE-FORMED VERTICALLY OBSTRUCTED INDENTATIONS. THE BASE OF THE HOUSING IS FORMED WITH CONCAVE SEATS HAVING END PORTIONS DETERMINED BY THE USE OF THE SAME AXIS OF GENERATION FOR AN ARCUATE SEAT AS USED FOR THE CIRCUMFERENCE OF THE ROLLER. CONTACT BY THE ROLLER WITH THIS ARCUATE SEAT EFFECTIVELY LIMITS SERVICE MOVEMENT OF THE ROLLER WHEN THE ROLLER MOVES TOWARD THE ENDS OF THE HOUSING EFFECTIVELY TRANSFERRING THE SERVICE FORCE TO THE BASE OF THE HOUSING RATHER THAN TO THE END OF THE HOUSING. THIS ROLLER SEAT HAS A CENTRALLY DIVIDING OPENING EXTENDING LONGITUDINALLY OF THE BASE TO ADMIT OF A RIVET OR OTHER SECURING FASTENER FOR FIXEDLY MOUNTING THE HOUSING TO THE TRUCK BOLSTER. THE HOUSING HAS LATERALLY EXTENDING WALLS TRIED TOGETHER BY A WEB DISPOSED AT EACH END AND BELOW THE TOP MARGINAL EDGE OF THE HOUSING AND WITHIN THE VERTICAL LIMITS OF THE AXIS OF THE ROLLER.

Feb. 9, 1971 o. INGRAM ETAL RAILWAY FREIGHT CAR SIDE BEARING HOUSINGS Filed D60. 13, 1968 Sheets-Sheet l a m m 7 a l| n /H I RI:

4 O 2 SW Z5 A J 1 w W... 2 s n//// Q I p G II I F %j fly zlll w M F a e. 2

w T N E W m ORVILLE INGRAM AND JAMES D. -HIPP Feb. 9, 1971 o. INGRAM ET AL 3,561,827

RAILWAY FREIGHT CAR SIDE BEARING HOUSINGS Filed Dec. 15. 1968 2 SheetsSheet 2 INVENTORS ORVILLE INGRAM AND JAMES D. HIPP United States Patent Office 3,561,827 RAILWAY FREIGHT CAR SIDE BEARING HOUSINGS Orville Ingram and James D. Hipp, Toledo, Ohio, as-

signors to Midland-Ross Corporation, Cleveland, Ohio,

a corporation of Ohio Filed Dec. 13, 1968, Ser. No. 783,614 Int. Cl. F16c 19/04 US. Cl. 308-138 7 Claims ABSTRACT OF THE DISCLOSURE A self clearing, self centering side bearing, a housing structure having a roller for engagement with the car body under service conditions. The housing for the roller is formed of a green sand casting free of core-formed vertically obstructed indentations. The base of the housing is formed with concave seats having end portions determined by the use of the same axis of generation for an arcuate seat as used for the circumference of the roller. Contact by the roller with this arcuate seat effectively limits service movement of the roller when the roller moves toward the ends of the housing effectively transferring the service force to the base of the housing rather than to the end of the housing. This roller seat has a centrally dividing opening extending longitudinally of the base to admit of a rivet or other securing fastener for fixedly mounting the housing to the truck bolster. The housing has laterally extending walls tied together by a web disposed at each end and below the top marginal edge of the housing and within the vertical limits of the axis of the roller.

BACKGROUND OF THE INVENTION Cast housings for railway freight car side bearings are old in the art, as exemplified by patents as early as A. Stucki Pat. 1,056,230.

Designs of this nature are producible by modern molding systems but the state of the arts require that cores be placed in the green sand mold. The placing of cores in automatic high production molding systems is both costly and time consuming in direct labor in both producing the core, as well as placing it in the sand mold as a separate operation.

When the cost of producing cast metal increased to a point of no economic return the state of the side bearing art changed to special rolled steel sections which were later forged to include features such as are shown in A. Stucki Pat. 1,806,003.

With the advent of highly automated molding systems presently available to the cast metal arts a return to cast metal side bearing housing is both feasible and desirable in order to take advantage of the disposition of metal to its best advantage for the use intended to economically produce a housing which properly functions to accom plish the required result, as well as long service life and a maintenance free device.

SUMMARY OF THE INVENTION The present invention relates to a railway freight car truck side bearing housing in which rollers are confined within a housing mounted on the truck bolster and located thereon under the body bolster side bearing wear plate structure.

3,561,827 Patented Feb. 9, 1971 The primary object of the present invention is to provide an improved side bearing housing structure which is castable in a green sand mold free of cores.

Another object of the invention is to provide a side bearing housing economically cast and having a base permitting of a roller which is self centering by the action of gravity acting on the roller moving along an inclined plane.

An additional object of the invention is to provide as an integral part of the base of the housing a limiting stop for longitudinal movement of the roller and to transfer through this stop service forces to the spring supported truck bolster.

A still further object of the invention is the provision of a limiting stop divided centrally by an opening extending longitudinally of the housing for the acceptance of a securing rivet to fasten the housing to the truck bolster and which will not obstruct the path of movement of the roller.

And further still an object of this invention is the provision of an opening in the ends of the housing walls formed in a core free mold whereby dirt, debris and other foreign matter may be easily discharged from the housing structure.

And still further an object of this invention is the provision of a web tying the sides of the housing above an opening in the ends but below the uppermost or marginal edge of the housing and Within vertical movement of the axis of the roller and still not require a core to form the opening.

An additional feature of this core free cast housing is the placement of the web member longitudinally beyond the normal movement of the roller, thus disposing of the problem of the roller contacting the end wall of the housing during service movement of the roller and eventual failure of the housing.

A still further feature of this invention is the placement of end flanges integral with and above the web member to contain the roller during free roller movement.

FIGURE DESCRIPTION FIG. 1 is a plan view of the invention. One of the twin rollers is removed to more clearly show the base of the housing and limiting means for stopping the roller during service movement.

FIG. 2 is a side elevation of the invention with a portion removed as on line 22 of FIG. 1.

FIG. 3 is a cross section of the housing taken on the line 33 of FIG. 2. The roller is removed to more clearly show the details of the housing.

FIG. 4 is a section taken on line 44 of FIG. 1, showing the parting line between the cope, or top portion, and drag, or bottom portion of the mold required to form the housing and is taken on this line to clearly show how the mold cavity is formed without the use of insertable cores.

FIG. 5 is a sectional view of the mold necessary to form the housing and is taken on line 5-5 of FIG. 1 and is taken on this line to clearly show how the mold cavity is formed without the use of cores and showing the parting line necessary in order that the cope and drag portions may be individually withdrawn from the pattern Without destroying any part of the mold.

FIG. 6 is a quarter section of the housing taken on line 6-6 of FIG. 1. Added to this view is a body wear plate and a roller to show the position of these parts during service forces of operation, particularly the relationship of the roller limiting stop, the roller, and the web which ties together the sides.

FIG. 7 is an enlarged portion of the mold taken bodily from FIG. 4 to more clearly show the parting line and how the green sand forms an opening between the base of the casting and the webs tying together the side walls.

DETAIL DESCRIPTION Referring now in detail to the drawings in which like reference characters designate like parts, bearings of this nature are positioned between the body bolster wear plate 10 and the truck bolster side bearing pad 11. Placed in the bearing pad 11 are holes 12 and 13 and have a hole spacing identical to holes 14 and 15 in the side bearing housing to receive rivets to fixedly mount the side hearing housing generally shown as to the truck bolster. One of the rollers shown is designated as 16.

The housing consists of a base generally shown as 21. Upstanding walls 22 and 23 terminate with reenforcing ribs 24 and 25. Walls 22 and 23 are tied together at each end by webs 26 and 27. Webs 26 and 27 are placed below the uppermost portion of the side walls, or reenforcing ribs 24 and 25. Disposed above webs 26 and 27 are end flanges 28, 29, 30 and 31 and are provided to confine roller 16 during its free movement.

Returning now to the base of the housing 20, at the ends of the roller surface are roller stops 35, 36, 37 and 38 having arcuate surfaces developed by the same axis as used to generate the roller surface or circumference. These roller stops are divided by a depressed area 40 as well as area 41 which are interrupted by rivet holes 14 and 15.

These depressed areas 40 and 41 extend longitudinally of the housing and partially bound the opening at each end of the housing. These openings permit of exclusion of foreign matter which may find its way into the housing.

Disposed above and forming a part of the opening is a larger opening defined by the limiting stops, side walls 23 and 22 and the bottom edge of web 26.

The base of the housing 20 has a suitable central rib and marginal ribs 51 and 52. The upper surface of the housing is deformed providing concave surfaces generally shown as 53 and 54. Substantially midway of this surface is a convex surface generally shown as 55.

The use of the coined word coradial as used in line 4 of claim 3 is intended to mean the two or more objects are developed uniformly around a common central axis.

The green sand mold necessary to form from molten metal the side bearing housing described is generally shown in FIG. 4 in longitudinal section as at 60. The cope, or top portion of the mold, is shown as 61, while the bottom portion, or drag, is shown as 62. When the cope 61 and the drag 62 are placed in matching relation the contacting surfaces form a parting line 63 and form a mold cavity 64 into which is poured fluid metal through a gate, not shown to avoid unnecessarily complicating the drawings with this and other standard foundry procedures. Jackets and 71 are conveniently employed to assist in holding the sand during ramming operations when the loose sand is rammed or packed about the pattern. The pattern is then withdrawn from the rammed sand which then constitutes two parts of mold 60, consisting in this case of a cope 61 and a drag 62. It will be understood that the withdrawal of the pattern from each mold part is accomplished without tearing the sand yet still providing an opening in the end defined by the limiting stops 36 or 37 of the base of the housing 21, a portion of the sides 22 and 23, and the bottom edge of web 26 or 27, without the use of insertable cores. To accomplish this the webs, either 26 or 27, together with the end flanges 28, 29, or 30 and 31 are transverse of and spaced longitudinally along side members 22 and 23 a sufficient distance to create a matching surface between the mold parts at the point where the end opening is desirable. This matching surface forms parting line 63 between the cope 61 and drag 62.

The creation of the end wall opening in this manner solves one of the major problems encountered with railway side bearing housings that is, the elimination of the roller striking the end wall of the housing during service operations. Under present operating conditions of high speed and larger loads in the freight cars, the service forces to which the roller is subjected form a destructive condition when the roller strikes the end Wall, and in many cases this has caused a failure of the side bearing housing. It is to be fully understood that the end wall structure shown in the drawings is disposed beyond the roller 16 when it has travelled to the roller stop as shown in FIG. 6. It is clear that the roller does not contact web 27.

It is the elimination of this parts failure and the economy of manufacture as outlined in this specification to which this invention is directed.

Having described our invention, we claim:

1. In a side bearing mountable between a truck and body of a railway vehicle and having roller means for engagement with the body, a cast housing for the roller means formed of a green sand casting free from coreformed vertically limited indentations said housing comprising a base member for supporting said roller means for longitudinal travel therealong, a pair of side members, and web member at each end of the housing tieing the ends of said side members, a wear plate member affixed to said body and disposed in a spaced relation above said roller means, transversely spaced roller travel limiting means integral with and forming a part of said base member, said limiting means at each end of said housing being disposed longitudinally inwardly of said web member and forming a roller stop, said web member being disposed longitudinally beyond the roller means when said roller means is in engagement with said stop, thereby eliminating roller means engagement with said web member, said web member forming the top marginal edge of an opening adjacent and equal to the width of said base member and a depressed area on said base member extending longitudinally thereof between said limiting means and defining the bottom edge of said opening for preventing the accumulation of moisture or other foreign matter within said housing.

2. A cast housing according to claim 1, comprising a base securable to and extending longitudinally of the truck, an upwardly facing concave seat on said base for supporting the roller means for rolling logitudinally therealong, said side members being in the form of side Walls upstanding from said base for laterally containing the roller rneans, end flanges extending inwardly from opposite ends of each side wall, each flange being spaced laterally from the adjoining end flange on the other side wall and serving to longitudinally contain the roller means, and said web member connecting portions of the adjoining end flanges for bracing said walls against transverse thrust from the roller means.

3. A cast housing according to claim 2, wherein the seat has cylindrically concave end portions forming said stop, each of said portions being upturned toward an adjoining end of the housing and coradial with the roller means for limiting service movements of the roller means longitudinally of the housing.

4. A cast housing according to claim 3, wherein the web members normally contain within vertical limits thereof axis means of the roller means.

5. A cast housing according to claim 3, wherein the roller means are a pair of rollers, and the seat end portions are each interrupted by an aperture extending vertically through and centered laterally on the base for receiving means for securing the base to the truck.

6. A cast housing according to claim 4, wherein said base has a pair of longitudinally adjoining concave surfaces joined by a laterally extending convex surface.

7. A cast housing according to claim 3, wherein said seat end portion rises a greater distance above the lowermost point of said concave seat than the clearance between the top portion of said roller and the contacting surface of said body wear plate, when said roller is presented for engagement with said body.

References Cited UNITED STATES PATENTS FRED C. MATTERN, IR., Primary Examiner 

